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https://github.com/whily/yalo

Lisp OS running on bare metal x86-64 hardware (WIP)
https://github.com/whily/yalo

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Lisp OS running on bare metal x86-64 hardware (WIP)

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README 

        
Yalo

====



# Target



Yalo is a Lisp OS running on bare metal x86-64 hardware. The system

programming language is **Ink**, a new Lisp dialect which combines the

elegance of Scheme and powerfulness of Common Lisp. The project webpage

is: 



# Status



The project is only at very very initial stage, with an

[assembler](https://github.com/whily/yalo/blob/master/doc/AssemblyX64.md)

written in Common Lisp, and a 64 bit bootloader.



"Short term" plan:



- [x] VGA text mode without using BIOS.

- [x] Keyboard handling without using BIOS.

- [x] Switch to 32 bit protected mode.

- [x] Switch to 64 bit long mode.

- [ ] Physical/virtual memory management.

- [ ] Userland and system call.

- [ ] Implement Ink interpreter with assembly.

- [ ] Self hosting a more powerful Ink interpreter with Ink itself.



# Getting Started



## Getting Bootable Image



Currently, cross compilation is needed to build one floppy image

containing yalo.



### [Cross compilation](https://github.com/whily/yalo/blob/master/doc/CrossCompilation.md)



Although yalo should compile on any Ansi Common Lisp implementation,

it is only tested on SBCL and Clozure CL (aka CCL).



Mandatory Requirements:

* [SBCL](http://sbcl.sourceforge.net SBCL) or [CCL](https://ccl.clozure.com/)

* git



Optional Requirements:

* Emacs

* SLIME



#### Getting Source Code



Run following command to anonymously checkout the latest source code

of yalo.



```shell

$ git clone https://github.com/whily/yalo.git

```



#### Setup link for ASDF



Run following commands to make SBCL/CCL aware of the ASDF file for the

cross compiler. Note that one only needs to run the script once.



```shell

$ cd yalo/cc

$ ./lnasdf

```



#### Build Floppy Image



##### With SBCL or CCL alone



For SBCL, in the root directory of the project (e.g. directory

`yalo`), run script `write-kernel-sbcl`. Afterwards,`floppy.img` is

written directly to the same directory, where scripts to run the image

(e.g. `run-bochs`) are located. It should be noted that it is assumed

that `sbcl` executable is installed in directory `/usr/bin`. Otherwise

modify script `write-kernel-sbcl` accordingly.



For CCL, in the root directory of the project, type the following at

REPL to generate `floppy.img`:



```lisp

(require 'asdf)

(asdf:oos 'asdf:load-op 'cc)

(in-package :cc)

(write-kernel "../floppy.img")

```



One may type `(ccl:quit)` to exit from CCL.



##### With Emacs+SLIME



Inside Emacs,



1. First type `M-x slime` if SLIME is not started.

2. Type `M-x slime-load-system` then type `cc` when prompted for the

   system.

3. At REPL, type `(in-package :cc)` to switch to package *cc*

   (alternatively, one can user keyboard shortcut `C-x M-p` and then type `cc`).

4. Type `(write-kernel "../floppy.img")` at SLIME REPL to generate the kernel.

   Here we assume that current directory is `cc` of the source tree, therefore

   `floppy.img` is written directly to the source tree, where scripts to run the

   image (e.g. `run-bochs`) are located.



Above is applicable for both SBCL and CCL, assuming SLIME is

configured properly for the CL implementation(s).



## Run Image



There are various ways to run the image.



### Bochs



Go to the root directory of the source code, where script `run-bochs`

is located. Run the scripts and select *6* to proceed emulation. After

invoking `run-bochs`, select *6*, emulation starts directly.



On HiDPI screens, the font of Bochs is too small to see. Therefore in

script `run-bochs`, there is one line related

to using SDL2 (make sure the library is installed) as display library

and starts the emulator in fullscreen mode, as below:



```

    'display_library: sdl2, options="fullscreen,gui_debug"'

```



Bochs header bar is not visible in full screen mode. Therefore one

needs to press `Ctrl+Alt+q` to shutdown Yalo to quit emulator.

Alternatively, one can modify the script files (e.g. removing

`fullscreen` option or deleting the line containing `display_library`

completely).



In addition, `scripts/build-boch` is the script the author used to

compile a customized Bochs.



Note that on Ubuntu (at least in 16.10), package `bochs-x` should be

installed in addition to package `bochs`.



### QEMU



Similar to Bochs, go to the root directory of the source code, where

script `run-qemu` and `debug-qemu` are located.



In both `run-qemu` and `debug-qemu`, QEMU monitor is redirectted to

stdio (via argument `-monitor stdio`). Script `run-qemu` will start

the emulator without GDB support; while `debug-qemu` enables GDB

support: `-s` argument makes QEMU listens to port 1234 for GDB, while

`-S` argument makes QEMU pauses at the beginning for GDB's `continue`

command. After running `debug-qemu` and starting GDB, first type

`target remote :1234` to connect to QEMU, then type command `continue`

to resume the emulation.



### VirtualBox



In the **Storage** page of the virtual machine settings, right click

and select "Add Floppy Controller". And the select the image file

`floppy.img` for floppy drive. In the **System** page of virtual

machine settings, make sure that Floppy is checked for Boot order.



Assuming the VM name is `yalo`, go to the root directory of the source

code, where script `run-virtualbox` and `debug-virtualbox` are

located. Run script `run-virtualbox` to start the emulator, or script

`debug-virtualbox` to start the emulator with debug window.



## Software version



So far, the development is done on Arch Linux. For above-mentioned

software, the corresponding version is listed below:



* SBCL: 1.4.10 or CCL 1.12

* Emacs: 26.1

* SLIME: 2.22

* Bochs: 2.6.9

* QEMU: 3.0.0

* VirtualBox: 5.2.18